Originally posted by Jagermeister
Hmm, my case isn't the biggest nor is it a very good case cooling wise (Apex TU-150), after adding a 120mm side intake fan, my temps dropped about 8 degrees celsius. Sure, the air flow is all screwed up, and some of my other components might be getting more heat... it's still worth it, IMO. The 120mm fan hits the GPU, CPU, and northbridge, cooling the three major heatsources.
Actually, I've found smaller cases get lower temps more easily than larger cases. (less space for air to ciruclate through)